This is a paid asset, but now you can download Sky Battle Free.
Detail this asset from Unity Store: Original Link
Sky Battle
Requirement: Unity 5.5
This template is ready for release. It is optimized for mobile (iPhone, iPad, Android, Windows Mobile) standalone (Windows PC and Mac OSX), web player and webGL. Sky battle is a criminally simple amazing game. Sky Raiders brings you an addictive and fun arcade game with fighter planes. You will battle squadrons of planes, helicopters and enemy bombers as you achieve upgrades to weapons and planes.
HOW TO PLAY
– Drag the plane to move, double click or press the bomb icon to use the bombs
FEATURES
– Addictive gameplay for hours of action
– 13 super stages to have fun, more updating stage (free)
– Lot of planes, helicopters, tanks and guns
– More than 20 unique enemies
– Upgrades to your units
– Plane Shop manager with 3 plane template
– Admob Interestitial, Unity Reward Video
– Clean, simple and easy to understand with C# code
– Simple to customize.
– Support touch controller on mobile device .
– Good performance for mobile.
– Works on all platforms, PC, Mac, iOS, Android, etc